A view of a building destroyed by a Saudi-led air strike is seen in Haradh city of Yemen's northwestern province of HajjaReuters

The United Nations has revealed that at least 1,037 civilians have now been killed in Yemen since the end of March.

It has warned Saudi Arabia and its allies – which began a bombing campaign in Yemen eight weeks ago – as well as Houthi rebels and other militia groups to adhere to obligations under international law not to harm civilians.

The Office of the UN High Commissioner for Human Rights (OHCHR) estimates that of the more than 1,000 dead, at least 130 are women and 234 children. A total of 2,453 civilians have been injured.

"There has also been massive destruction of civilian infrastructure, particularly in Aden and Sada'ah," Cécile Pouilly, OHCHR spokesperson told reporters in Geneva.

Saudi Arabia announced an end to Operation Decisive Storm – under which it had pounded Sana'a and Houthi towns and cities in the north with air strikes for over a month – in April.

Map showing the latest clashes between the Saudi-led coalition and Houthi militias, and the territorial control in Yemen.RNGS Reuters

Instead Riyadh launched Operation Renewal of Hope, which aimed to rebuild Yemen and push the Houthi out of Sana'a, and back into their northern heartland.

But the war has continued in earnest, with Houthi making gains in the southern city of Aden and even attacking Saudi border posts in the north.

Saudi airstrikes have continued to pound Yemen in recent weeks, although a five-day humanitarian took place between 12 May and 17 May.